Went to a gig last night and an acquaintance of mine, of Mapuche origin, played this weird instrument during a hardcore punk set which I later found out to be a "trutruca" or "trutruka." It is essentially a traditional wind instrument used by Mapuche people. It is of the trumpet family.

Here are some relevant links:
https://en.wikipedia.org/wiki/Trutruca

http://www.travelsur.net/facts265.htm

https://www.memoriachilena.gob.cl/602/w3-article-94002.html

https://www.tesauroregional.cl/terminos/2859

https://www.britannica.com/art/trutruka

https://www.chilepatrimonios.gob.cl/ficha?doi=05SDC-3-30867